The Honeywell LED String Lights' included bulbs are impact-resistant and are easy to install and connect. They provide a robust 30 lumens per bulb and 540 per string. The built-in Bluetooth speakers produce crisp, clear audio- ideal for every-day or special occasions. These LED string lights can be linked with up to 3 sets. The Indoor/Outdoor 36’ String Lights use a fraction of the energy traditional string lights use. They are built with a commercial-strength cord that withstands extreme temperatures and wet weather for year-round enjoyment while reducing your overall energy usage. These LED party lights are sure to save you energy costs over other commercial lighting options. They are incredibly easy to install and allow you to mount them in any way you see fit, whether for permanent or temporary display. They replicate a retro café-style light that will illuminate your favorite outdoor area and also offer you the modern functionality and efficiency you need. Mounting hardware is not included, so you can choose to use traditional hammer and nails or less permanent options. The Honeywell LED Indoor/Outdoor String Lights are backed by a 5-year warranty.